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Regarding radiotelephony procedures, a distress condition is one…

  • A
    that requires a PAN PAN broadcast.
  • B
    concerning the safety of an aircraft, but which does not require immediate assistance.
  • C
    that requires setting the transponder code 7600.
  • D
    of serious and/or imminent danger requiring immediate assistance.

ICAO Annex 10, Volume II

Distress messages. This message category shall comprise those messages sent by mobile stations reporting that tthey are threatened by grave and imminent danger and all other messages relative to the immediate assistance required by the mobile station in distress.

Urgency messages. This category shall comprise messages concerning the safety of a ship, aircraft or other vehicles, or of some person on board or within sight.

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